It depends what else is on the array. Generally you should try and balance the load across both SPs. So create at least 2 Datastores, one owned by SP-A, one by SP-B. A LUN or Datastore is online to one SP, VMware will only send I/O to the SP owning the datastore. You will see half the paths as "Active (I/O)" and the other half as just "Active". The Multipathing should be using VMTP_ALUA_CX and Round Robin.

I am guessing you are using Fibrechannel so make sure all ESX hosts are zoned to ports on both SPs.

I don't understand what you mean with your last question.

Have you connected the Unity to your vCenter server? (In Unisphere: Access -> VMware) If so, then you can create a new VMFS datastore in Unisphere (Storage -> VMware), then decide which Hosts can access it. The Unisphere wizard will then contact vCenter and tell it to rescan for new datastores, setting up the new Datastore automatically.

Regards,

Stephen

I mean, you can add two Datastores for sure.

But what if I add LUN0 as Datastore and expand this one by extend from LUN1.

You could do that. But why would you need to use extents? VMware doesn't stripe data across extents.

Datastores can be expanded by increasing the size of the LUN/Datastore on the Unity.

I had never heard of this before (extents in VMware), but here's an interesting blog post:

https://blogs.vmware.com/vsphere/2012/02/vmfs-extents-are-they-bad-or-simply-misunderstood.html

I don't think you can use the integration between Unisphere and vCenter to configure this. You would have use the LUN/Block assignement method (the old-fashioned way) and manually set up the Datastore in VMware.